if (document.images) {
    btn_novice       = new Image();
    btn_novice.src = "images/menu/novice_normal.jpg";
    btn_novice_over  = new Image();
    btn_novice_over.src = "images/menu/novice_over.jpg";
    btn_o = new Image();
    btn_o.src = "images/menu/o_normal.jpg";
    btn_o_over = new Image();
    btn_o_over.src = "images/menu/o_over.jpg";
    btn_program = new Image();
    btn_program.src = "images/menu/program_normal.jpg";
    btn_program_over = new Image();
    btn_program_over.src = "images/menu/program_over.jpg";
    btn_vstopnice = new Image();
    btn_vstopnice.src = "images/menu/vstopnice_normal.jpg";
    btn_vstopnice_over = new Image();
    btn_vstopnice_over.src = "images/menu/vstopnice_over.jpg";
    btn_galerija = new Image();
    btn_galerija.src = "images/menu/galerija_normal.jpg";
    btn_galerija_over = new Image();
    btn_galerija_over.src = "images/menu/galerija_over.jpg";
    btn_press = new Image();
    btn_press.src = "images/menu/press_normal.jpg";
    btn_press_over = new Image();
    btn_press_over.src = "images/menu/press_over.jpg";
    btn_povezave = new Image();
    btn_povezave.src = "images/menu/povezave_normal.jpg";
    btn_povezave_over = new Image();
    btn_povezave_over.src = "images/menu/povezave_over.jpg";
}
function buttondown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "_over.src" );
    }
}
function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + ".src" );
    }
}